I use SanDisk Compact Flash Cards exclusively. Currently, they rate their 64GB Extreme UDMA CFC's at 60Mb/s. Their Extreme Pro UDMA 6 cards are rated at 90Mb/s. Their 64GB Extreme Pro UDMA 7 cards are rated at 160Mb/s. The 128GB Extreme Pro UDMA 7 cards are rated at both 100 and 160Mb/s. What is the recommended storage capacity and Mb/s read/write speed for the IQ180 Back? What does UDMA stand for and how do the UDMA, UDMA 6 and UDMA 7 differ, relative to the IQ180?

UDMA 7, which stands for Ultra Direct Mode Access 7, is the latest transfer mode under the UDMA interface. UDMA 7 allows a maximum transfer rate of up to 167MB/sec. This can be compared to the previous UDMA mode, UDMA 6, which allowed transfer rates of up to 133MB/sec.OK. That answers that question. What is the recommended MB/s speed and storage capacity for the IQ180?

IQ180 can do bursts of 117mb/s. My recommendation is the 90mb/s cards at whatever capacity suits you best. At that speed you shouldn't have to deal with any buffering while shooting high speed on the back. Personally I don't like to go over 16 or 32GB so as not to put all my eggs in one basket.

Thanks, Jon. The new SanDisk CFC's are rated at 120 MB/s. If the 180 can do bursts of 117 MB/s, can I assume that the 120 MB/s cards will be fine? That just indicates how fast it will take data from my system, at a max of 120 MB/s As I shoot, loading the buffer with data, the buffer will simultaneously transfer that data into the CFC, at the max rate of 120 MB/s. If the buffer holds 500 MB worth of data, it will take about 5 seconds to move it into the CFC. I have not updated my Mamiya 645DF+ or IQ180 firmware since I received the system. How do I read the current 645DF+ firmware and the IQ180 firmware? Will an Extreme Pro, 64GB, 120MB/s card work in any firmware edition?

Thank you for the helpful response. I haven't tried it yet because if it is not suitable I want to return it. So it is still unopened.I see that I mistyped my message: I should have said IQ260 not IQ160. Does your advice still apply? If so, I will open it and let you know whether it works.